US Home Filter SC40-20X24X4 MERV 8 Pleated Air Filter (3 Pack)， 20" x 24" x 4"</br></br><div style="text-align:left"><b>[Product Information]</b><br><ul><li>Actual size: 19-3/8 inch x 23-3/8 inch x 3-5/8 inch</li><li>Merv 8 tested under ashram 52.2-2007 standards</li><li>Ideal for normal air filtration and those with mild allergies</li><li>Moisture resistant， heavy-duty Frame</li><li>Galvanized expanded metal backing</li></ul></div></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br></br><img src='http://ecx.images-amazon.com/images/I/51e1DH-WXiL.jpg' noproxy></br>